SOLUTION: my father is 21 years older than me, after a time period of 12 years his age is twice of my age. how old am i ?

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Question 456609: my father is 21 years older than me, after a time period of 12 years his age is twice of my age. how old am i ?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
my father is 21 years older than me, after a time period of 12 years his age is twice of my age. how old am i ?
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Equations:
f = m + 21
(f+12)=2(m+12)
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Substitute for "f" and solve for "m":
(m+21+12) = 2m+24
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m = 9 yrs ("me's" age now)
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Cheers,
Stan H.